Will 2 18'' BTL N2 subwoofers fit in the back of my 98' 4runner?

I have just turned 16. and i am planning on buying to 18'' btl n2's for my 98 4runner. Also i was planning on getting the Hifonics colossus LTD amp. but i have been looking around and cannot find anyone who has them. so i was wondering if they would fit. And i am kinda new with subs so try not to talk complicated. lol thanks.